VETERANS DAY PHOTO GALLERY: Memorable images of US troops at war, from WWI to Afghanistan

There are very few bonds in life stronger than among those who have served in the Armed Forces — soldiers, sailors and others who volunteered out of a sense of duty or who responded when called upon.

Cemeteries across the country pay tribute to those who paid the ultimate price.

The last U.S. veteran of World War I is gone and the ranks of World War II and Korean War vets are dwindling. Baby boomers who served in Vietnam are retiring. And with the pullout of troops from Afghanistan, the U.S. commitment there and in Iraq is coming to an end.